1980 Ski-Doo Shop Manual, Page 155Get this manual
SECTION 03 SUB-SECTION 03, (IGNITION TIMING)
With piston at specified position, slacken lower breaker point retaining screw then readjust breaker points gap
until fluctuates or tone signal level varies
Engine type
Edge gap 12 mm
" If timing IS too early decrease breaker points gap toward lower limit, i.e0.30 mm (.012"), then
recheck timing
377,444, 464, 503 640
(.31572")10 mm (.275 -394")
If timing is too late increase breaker points gap toward upper limit, i.eOAO mm (.016"), then recheck timingNOTE: Breaker points gap car change upon tighteningAlways recheck after tighteningEdge gap
EDGE GAP VERIFICATION
By following either of the procedures mentioned herein the edge gap will automatically be adjusted, However, if the edge gap is to be verified, proceed as follows: